流布局面板 [英] Flow Layout Panel

问题描述

Windows窗体应用程序

如何在flowLayoutPanel中创建两个标签?

我希望它们成为flowLayoutPanel中的第一个和最后一个控件，以便添加的任何控件都不会影响它们的位置.

感谢您的帮助.

Windows Form Application

How do I create two labels in the flowLayoutPanel?

I want them to be the first and last control in flowLayoutPanel so that any controls added won''t affect their positions.

Thanks for your help.

推荐答案

您不能，FlowLayoutPanel不能那样工作.

您可以做的是编写一个自定义的AddMethod，该方法将最后一项删除并读取，如下所示:

You can''t, FlowLayoutPanel doesn''t work that way.

What you could do is write a custom AddMethod that takes the last item and removes it and readds it, something like this:

private static void AddStuff(FlowLayoutPanel panel, Control control)
{
    Control last = panel.Controls[panel.Controls.Count - 1];
    panel.Controls.Remove(last);
    panel.Controls.Add(control);
    panel.Controls.Add(last);
}

或类似的东西.

希望这会有所帮助，
Fredrik Bornander

Or something like it.

Hope this helps,
Fredrik Bornander

尝试一下(SetChildIndex可以解决问题)

Try this (SetChildIndex does the trick)

using System;
using System.Windows.Forms;
namespace FlowLayoutPanelTest
{
    static class Program
    {
        static void Main()
        {
            Application.Run(new TestForm());
        }
        class TestForm : Form
        {
            public TestForm()
            {
                FlowLayoutPanel flowlayoutpanel = new FlowLayoutPanel();
                flowlayoutpanel.Dock = DockStyle.Fill;
               
                Button buttonAddControl = new Button();
                buttonAddControl.Text = "Add Control";
                buttonAddControl.Dock = DockStyle.Bottom;
                buttonAddControl.Click += delegate(object obj, EventArgs ea)
                {
                    AddControlToFlowLayoutPanel(flowlayoutpanel, new Button()); // add any control
                };
                Label labelFirst = new Label();
                labelFirst.Text = "First";
                Label labelLast = new Label();
                labelLast.Text = "Last";
                flowlayoutpanel.Controls.Add(labelFirst);
                flowlayoutpanel.Controls.Add(labelLast);
                Controls.Add(flowlayoutpanel);
                Controls.Add(buttonAddControl);
            }
            void AddControlToFlowLayoutPanel(FlowLayoutPanel flowlayoutpanel, Control ctrl)
            {
                flowlayoutpanel.Controls.Add(ctrl);
                // SetChildIndex does the trick
                if (flowlayoutpanel.Controls.Count > 2)
                    flowlayoutpanel.Controls.SetChildIndex(ctrl, flowlayoutpanel.Controls.Count - 2);
            }
        }
    }
}

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